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6. [-/1 Points] DETAILS SCALCET9 16.7.023.MI. MY NOTES ASK YOUR TEACHER PRACTICE ANOTHER Evaluate the surface integral F . dS for the given vector field F and the oriented surface S. In other words, find the flux of F across S. For closed surfaces, use the positive (outward) orientation. F(x, y, z) = xyi + yzj + zxk, S is the part of the paraboloid z = 4 - x2 - y that lies above the square 0